Been informed that my Crankshaft Seal is leaking oil. Is this a common problem for an 00 S4? How difficult for a normal mechanic to change this part. Does it require the removal of the whole engine to get to the clutch. If it does, then i am willing to splash out on a new Rs4 clutch even though there isn't anything wrong with the clutch but it has done 55K. Sorry if I sound like an idiot.